In the image, the 25-year-old is seen hugging the DJ and the duo has even flashed slight smiles. Gigi and Joe, meanwhile, are seen sitting close to each other and next to Swift. The couples were also joined by their friend Karlie Kloss.
Courtesy of Twitter
The photograph was taken while they were riding a boat with sunset and the iconic London's Tower Bridge as the backdrop.
"Little known fact: Karlie is secretly an unofficial historian/London tour guide. Kind of," the "Shake It Off" singer captioned the image.
On Saturday night, Swift invited onstage some of her best friends including Hadid, Kloss, Cara Delevingne, Kendall Jenner, Martha Hunt, Emma Watson and tennis player Serena Williams as she performed in an event as a part of British Summer Time.
This is not the first time Swift and Harris were spotted going on double date with Hadid and Kloss. Earlier this month, the pairs reportedly had lunch together in Los Angeles after Swift threw a baby shower for her friend Jaime King.